ubiquity crashed with TypeError in changed(): value is of wrong type for this column

The message (screenshot posted in Comment #2) was displayed hitting the enter key I got it to boot to X, it reported several applets failed, and then I clicked on install the system, and the installer crashed as reported.

thought I will also mention that after I reported this problem, and closed firefox, the installer allowed me to install the system and it completed. (I would expect since I reported a bug with ubiquity it should offer to power down the machine or simply quit installing at this point), but when I reboot the system, I get a grub rescue prompt.

I recreated the usb stick with Natty AMD64 PC image and I get the same result, I just wanted to rule out USB image corruption due to my previous install. While installing on 2.5Tb and 3Tb disk the installer quits and boots into ubuntu live cd image.

Jan 21 22:28:27 ubuntu ubiquity[8551]: Traceback (most recent call last):
Jan 21 22:28:27 ubuntu ubiquity[8551]: File "/usr/lib/ubiquity/plugins/ubi-timezone.py", line 130, in changed
Jan 21 22:28:27 ubuntu ubiquity[8551]: loc.latitude, loc.longitude])
Jan 21 22:28:27 ubuntu ubiquity[8551]: TypeError: value is of wrong type for this column

Can you tell us roughly what geographical region you were in when attempting this installation? This is happening on the timezone page; since you mention reproducing this and don't mention doing anything in particular on the timezone page where this crash happens, I'm guessing it must arise from your GeoIP-detected location.

I was connected to the network and it normally picks up Chicago as my location, Chicago is in the same time zone as Austin (Central US).

Here too,
'This is happening on the timezone page;'
Vancouver, for me. PST time zone.
VBox Install, 'Ubuntu 11.04 _Natty Narwhal_ - Alpha amd64 (20110124.2)'
============================
Ubiquity 2.5.11
update_release_notes_label()
update_release_notes_label()
update_release_notes_label()
/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py:1305: GtkWarning: IA__gtk_progress_set_percentage: assertion `percentage >= 0 && percentage <= 1.0' failed
  self.install_progress.set_fraction(fraction)
Exception in GTK frontend (invoking crash handler):
Traceback (most recent call last):
  File "/usr/lib/ubiquity/plugins/ubi-timezone.py", line 130, in changed
    loc.latitude, loc.longitude])
TypeError: value is of wrong type for this column

Traceback (most recent call last):
  File "/usr/lib/ubiquity/plugins/ubi-timezone.py", line 130, in changed
    loc.latitude, loc.longitude])
TypeError: value is of wrong type for this column
==========================

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #702898, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.